Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [6];  [2];  [7];  [4];  [3];  [8];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); OSTI
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. National Sun Yat-sen University, Kaohsiung (Taiwan)
  4. Univ. of South Florida, Tampa, FL (United States)
  5. Princeton Univ., NJ (United States)
  6. Aalto Univ., Otaniemi (Finland). School of Science
  7. Rice Univ., Houston, TX (United States)
  8. Academia Sinica, Taipei (Taiwan)
+ Show Author Affiliations
The electronic and magnetic properties of transition metal dichalcogenides are known to be extremely sensitive to their structure. In this paper we study the effect of structure on the electronic and magnetic properties of mono- and bilayer VSe2 films grown using molecular beam epitaxy. VSe2 has recently attracted much attention due to reports of emergent ferromagnetism in the two-dimensional (2D) limit. To understand this compound, high-quality 1$$\textit{T}$$ and distorted 1$$\textit{T}$$ films were grown at temperatures of 200 °C and 450 °C, respectively, and studied using 4 K scanning tunneling microscopy and spectroscopy. The measured density of states and the charge density wave (CDW) patterns were compared to band structure and phonon dispersion calculations. Films in the 1$$\textit{T}$$ phase reveal different CDW patterns in the first layer compared to the second. Interestingly, we find the second layer of the 1$$\textit{T}$$ film shows a CDW pattern with 4$$\textit{a}$$ × 4$$\textit{a}$$ periodicity which is the 2D version of the bulk CDW observed in this compound. We report our phonon dispersion calculations confirm the presence of a soft phonon at the correct wave vector that leads to this CDW. In contrast, the first layer of distorted 1$$\textit{T}$$ phase films shows a strong stripe feature with varying periodicities, while the second layer displays no observable CDW pattern. Finally, we find that the monolayer 1$$\textit{T}$$ VSe2 film is weakly ferromagnetic, with ~3.5 $$μ_B$$ per unit similar to previous reports.
Research Organization:
Univ. of South Florida, Tampa, FL (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation; National Center for Theoretical Sciences; National Science Foundation(NSF); Taiwan Ministry of Science and Technology (MOST); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
NA0003910
OSTI ID:
1801169
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 102; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (38)

From Bulk to Monolayer MoS2: Evolution of Raman Scattering journal January 2012
Extraordinarily Strong Interlayer Interaction in 2D Layered PtS 2 journal February 2016
Ultrathin Nanosheets of Vanadium Diselenide: A Metallic Two-Dimensional Material with Ferromagnetic Charge-Density-Wave Behavior journal August 2013
Pseudogap, Fermi arc, and Peierls-insulating phase induced by 3D–2D crossover in monolayer VSe2 journal September 2018
Anomalous electrical and magnetic properties of vanadium diselenide journal December 1976
Magnetic susceptibility and electrical properties of VSe2 single crystals journal October 1976
First principles phonon calculations in materials science journal November 2015
Charge Density Wave State Suppresses Ferromagnetic Ordering in VSe 2 Monolayers journal May 2019
Absence of Ferromagnetism in VSe 2 Caused by Its Charge Density Wave Phase journal October 2019
Electronic Structure and Enhanced Charge-Density Wave Order of Monolayer VSe 2 journal June 2018
Emergence of a Metal–Insulator Transition and High-Temperature Charge-Density Waves in VSe 2 at the Monolayer Limit journal July 2018
Evidence of the Existence of Magnetism in Pristine VX 2 Monolayers (X = S, Se) and Their Strain-Induced Tunable Magnetic Properties journal January 2012
2D transition metal dichalcogenides journal June 2017
Electronics and optoelectronics of two-dimensional transition metal dichalcogenides journal November 2012
Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe2 journal December 2013
Strongly enhanced charge-density-wave order in monolayer NbSe2 journal July 2015
Quantum spin Hall state in monolayer 1T'-WTe2 journal June 2017
Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates journal February 2018
Signatures of the Kondo effect in VSe2 journal September 2017
Electronic structure of monolayer 1T′-MoTe 2 grown by molecular beam epitaxy journal February 2018
Quantum phase transition from triangular to stripe charge order in NbSe2 journal January 2013
The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties journal May 1969
Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn 0.25 TaS 2 and Fe 0.25 TaS 2 journal July 2016
Dimensional crossover of the charge density wave transition in thin exfoliated VSe 2 journal September 2017
Self-Consistent Equations Including Exchange and Correlation Effects journal November 1965
Special points for Brillouin-zone integrations journal June 1976
Theory of discommensurations and the commensurate-incommensurate charge-density-wave phase transition journal August 1976
Self-interaction correction to density-functional approximations for many-electron systems journal May 1981
Ab initiomolecular dynamics for liquid metals journal January 1993
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Inhomogeneous Electron Gas journal March 1973
Atomically Thin MoS2 A New Direct-Gap Semiconductor journal September 2010
Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe 2 journal November 2018
Ground State of the Electron Gas by a Stochastic Method journal August 1980
Generalized Gradient Approximation Made Simple journal October 1996
Strain engineering a 4 a × √ 3 a charge-density-wave phase in transition-metal dichalcogenide 1 T − VS e 2 journal July 2017
Two-Dimensional Materials from Data Filtering and Ab Initio Calculations journal July 2013

Similar Records

Competing magnetic and nonmagnetic states in monolayer VSe2 with charge density wave
Journal Article · Wed Aug 10 20:00:00 EDT 2022 · Physical Review. B · OSTI ID:1883735
Quantum Monte Carlo and Density Functional Theory Study of Strain and Magnetism in 2D 1T-VSe2 with Charge Density Wave States
Journal Article · Thu Mar 06 19:00:00 EST 2025 · ACS Nano · OSTI ID:2573272

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Materials Science
Physics